Annuals with tall stems work well for cut flowers....tall marigolds, zinnias, snapdragons.....they all can be direct seeded, but take a while to flower.....Dahlias are the buzz flowers right now....plant tubers in May, get flowers in July or August....glads are great cut flowers, too. I used to sell glads by the roadside, but thrips ruined my crop, & I gave it up....